A common species throughout Belgium.

The larva lives on Corylus avellana. It makes a long mine between two veins on the underside of the leaf, and is strongly arched. Pupation in a white cocoon attached to both upper and lower epidermis inside the mine. The pupa of the second generation hibernates.

The adults fly in two generations a year: in May-June and in August-September.

ID mine: underside of the leaf, elongate (15-20mm long) with several creases in lower epidermis and with a strong central fold. The upper epidermis has a central green patch of uneaten parenchyma with brown flecks around the edges.